Choosing a fan with a good brand means choosing quality, which is an important guarantee for the quality of the fan.
From the external surface, it should be relatively thick and the color is relatively pure. There is no burr on the edge of the frame blade. According to the thickness of the fan blade, there is not too much deformation when the outer frame is held by hand.
Because the bearing is divided into ball bearing and oil bearing. The ball bearing has long service life, low noise, but high price. The service life of oil-bearing is 1 / 3 shorter than that of ball bearing and some noise may occur when it is used for more than one year, but its price is cheap. The service life of the bearings (except the oil bearing) in the new products promoted by various manufacturers will not exceed that of the ball bearing, and there will be noise after used for some time in the future.
After the fan runs normally:
a. Only the wind noise should be heard. If there are other noise, it means that the quality is not very good. If the speed of the fan with the thickness of 7 cm does not exceed 3500RPM while the wind is loud, the quality of the DC cooling fans is too poor.
b. Grasp the fan by hand and feel its vibration. After changing the angle, if the hand feels the same vibration, it shows that the vibration of the fan is very good. If there is vibration, it may cause co-vibration on the chassis. In the past, some people made a loud noise when they started the machine. Actually, it was mainly caused by the vibration when the fan started.
c. Stop the fan from rotating (don't break the fan blade) for about one minute. Touch the center of the fan blade to feel the temperature. If the temperature is high, it is unqualified. This can prevent the fan from being burned when it is stuck and causing fire.
Now as a leading motor cooling fan supplier, WHEE provides the following two parameters for your reference: the speed does not exceed 3500RPM in the thickness of 7 cm and 8 cm, without other functions of the parameters: starting voltage: less than 7V current: operating current less than 250mA (that it greater than 250mA means that the product is not qualified)
In the above five points, 2, 4 and 5 are the basic indicators of fans. I hope you can make good use of them in your purchase.
The DC cooling fans produced by Dongguan Wanhang Electronic Technology Co., Ltd. are moisture-proof, waterproof, and has passed strict inspection before leaving the factory, including high pressure resistance, damp heat resistance, low temperature resistance, high temperature resistance, impact resistance, life test, etc. Please feel free to use it!